156145561 has 16 divisors (see below), whose sum is σ = 194237568. Its totient is φ = 123321600.

The previous prime is 156145559. The next prime is 156145567. The reversal of 156145561 is 165541651.

It is a cyclic number.

It is not a de Polignac number, because 156145561 - 2¹ = 156145559 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (156145567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29685 + ... + 34546.

It is an arithmetic number, because the mean of its divisors is an integer number (12139848).

Almost surely, 2^156145561 is an apocalyptic number.

156145561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

156145561 is a deficient number, since it is larger than the sum of its proper divisors (38092007).

156145561 is a wasteful number, since it uses less digits than its factorization.

156145561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64272.

The product of its digits is 18000, while the sum is 34.

The square root of 156145561 is about 12495.8217416863. The cubic root of 156145561 is about 538.4886420250.

The spelling of 156145561 in words is "one hundred fifty-six million, one hundred forty-five thousand, five hundred sixty-one".