261254656656157 has 8 divisors (see below), whose sum is σ = 262860551363936. Its totient is φ = 259648799819472.

The previous prime is 261254656656151. The next prime is 261254656656163. The reversal of 261254656656157 is 751656656452162.

It is an interprime number because it is at equal distance from previous prime (261254656656151) and next prime (261254656656163).

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 261254656656157 - 2¹¹ = 261254656654109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261254656656092 and 261254656656101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261254656656151) 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, 4434223 + ... + 23284579.

It is an arithmetic number, because the mean of its divisors is an integer number (32857568920492).

Almost surely, 2^{261254656656157} is an apocalyptic number.

It is an amenable number.

261254656656157 is a deficient number, since it is larger than the sum of its proper divisors (1605894707779).

261254656656157 is a wasteful number, since it uses less digits than its factorization.

261254656656157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18935547.

The product of its digits is 544320000, while the sum is 67.

The spelling of 261254656656157 in words is "two hundred sixty-one trillion, two hundred fifty-four billion, six hundred fifty-six million, six hundred fifty-six thousand, one hundred fifty-seven".