256165061501 has 8 divisors (see below), whose sum is σ = 256967998560. Its totient is φ = 255362865808.

The previous prime is 256165061461. The next prime is 256165061543. The reversal of 256165061501 is 105160561652.

It is a happy number.

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 256165061501 - 2²⁶ = 256097952637 is a prime.

It is a super-2 number, since 2×256165061501² (a number of 24 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 (256165001501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 510890 + ... + 879396.

It is an arithmetic number, because the mean of its divisors is an integer number (32120999820).

Almost surely, 2^256165061501 is an apocalyptic number.

It is an amenable number.

256165061501 is a deficient number, since it is larger than the sum of its proper divisors (802937059).

256165061501 is a wasteful number, since it uses less digits than its factorization.

256165061501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370683.

The product of its (nonzero) digits is 54000, while the sum is 38.

The spelling of 256165061501 in words is "two hundred fifty-six billion, one hundred sixty-five million, sixty-one thousand, five hundred one".