2156937477 has 8 divisors (see below), whose sum is σ = 2887950720. Its totient is φ = 1431941280.

The previous prime is 2156937467. The next prime is 2156937481. The reversal of 2156937477 is 7747396512.

It is a happy number.

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

It is not a de Polignac number, because 2156937477 - 2⁸ = 2156937221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156937427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1503424 + ... + 1504857.

It is an arithmetic number, because the mean of its divisors is an integer number (360993840).

Almost surely, 2^2156937477 is an apocalyptic number.

It is an amenable number.

2156937477 is a deficient number, since it is larger than the sum of its proper divisors (731013243).

2156937477 is a wasteful number, since it uses less digits than its factorization.

2156937477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3008523.

The product of its digits is 2222640, while the sum is 51.

The square root of 2156937477 is about 46442.8409660736. The cubic root of 2156937477 is about 1292.0495985985.

The spelling of 2156937477 in words is "two billion, one hundred fifty-six million, nine hundred thirty-seven thousand, four hundred seventy-seven".