2156140642 has 8 divisors (see below), whose sum is σ = 3242526300. Its totient is φ = 1075298544.

The previous prime is 2156140619. The next prime is 2156140643. The reversal of 2156140642 is 2460416512.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2155652041 + 488601 = 46429^2 + 699^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (2156140643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1384917 + ... + 1386472.

Almost surely, 2^2156140642 is an apocalyptic number.

2156140642 is a deficient number, since it is larger than the sum of its proper divisors (1086385658).

2156140642 is a wasteful number, since it uses less digits than its factorization.

2156140642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2771780.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 2156140642 is about 46434.2615102254. The cubic root of 2156140642 is about 1291.8904721888.

The spelling of 2156140642 in words is "two billion, one hundred fifty-six million, one hundred forty thousand, six hundred forty-two".