156656121551 has 8 divisors (see below), whose sum is σ = 164906365680. Its totient is φ = 148406395968.

The previous prime is 156656121529. The next prime is 156656121563. The reversal of 156656121551 is 155121656651.

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

It is a cyclic number.

It is not a de Polignac number, because 156656121551 - 2²² = 156651927247 is a prime.

It is a super-2 number, since 2×156656121551² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156656121151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 594155 + ... + 816291.

It is an arithmetic number, because the mean of its divisors is an integer number (20613295710).

Almost surely, 2^156656121551 is an apocalyptic number.

156656121551 is a deficient number, since it is larger than the sum of its proper divisors (8250244129).

156656121551 is a wasteful number, since it uses less digits than its factorization.

156656121551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259273.

The product of its digits is 270000, while the sum is 44.

The spelling of 156656121551 in words is "one hundred fifty-six billion, six hundred fifty-six million, one hundred twenty-one thousand, five hundred fifty-one".