156401012381 has 2 divisors, whose sum is σ = 156401012382. Its totient is φ = 156401012380.

The previous prime is 156401012363. The next prime is 156401012461. The reversal of 156401012381 is 183210104651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145805604025 + 10595408356 = 381845^2 + 102934^2 .

It is a cyclic number.

It is not a de Polignac number, because 156401012381 - 2³⁴ = 139221143197 is a prime.

It is a super-2 number, since 2×156401012381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156401012681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78200506190 + 78200506191.

It is an arithmetic number, because the mean of its divisors is an integer number (78200506191).

Almost surely, 2^156401012381 is an apocalyptic number.

It is an amenable number.

156401012381 is a deficient number, since it is larger than the sum of its proper divisors (1).

156401012381 is an equidigital number, since it uses as much as digits as its factorization.

156401012381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 32.

The spelling of 156401012381 in words is "one hundred fifty-six billion, four hundred one million, twelve thousand, three hundred eighty-one".