2156651032551 has 16 divisors (see below), whose sum is σ = 2889569612928. Its totient is φ = 1430751823200.

The previous prime is 2156651032493. The next prime is 2156651032559. The reversal of 2156651032551 is 1552301566512.

It is a happy number.

It is not a de Polignac number, because 2156651032551 - 2¹⁹ = 2156650508263 is a prime.

It is a super-2 number, since 2×2156651032551² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156651032559) 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, 4328325 + ... + 4800801.

It is an arithmetic number, because the mean of its divisors is an integer number (180598100808).

Almost surely, 2^{2156651032551} is an apocalyptic number.

2156651032551 is a deficient number, since it is larger than the sum of its proper divisors (732918580377).

2156651032551 is a wasteful number, since it uses less digits than its factorization.

2156651032551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479902.

The product of its (nonzero) digits is 270000, while the sum is 42.

The spelling of 2156651032551 in words is "two trillion, one hundred fifty-six billion, six hundred fifty-one million, thirty-two thousand, five hundred fifty-one".