1561659495 has 64 divisors (see below), whose sum is σ = 2918246400. Its totient is φ = 705075840.

The previous prime is 1561659427. The next prime is 1561659511. The reversal of 1561659495 is 5949561651.

It is not a de Polignac number, because 1561659495 - 2¹² = 1561655399 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 180744 + ... + 189186.

It is an arithmetic number, because the mean of its divisors is an integer number (45597600).

Almost surely, 2^1561659495 is an apocalyptic number.

1561659495 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1561659495 is a deficient number, since it is larger than the sum of its proper divisors (1356586905).

1561659495 is a wasteful number, since it uses less digits than its factorization.

1561659495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8540.

The product of its digits is 1458000, while the sum is 51.

The square root of 1561659495 is about 39517.8376812295. The cubic root of 1561659495 is about 1160.1891028906.

The spelling of 1561659495 in words is "one billion, five hundred sixty-one million, six hundred fifty-nine thousand, four hundred ninety-five".