157562911537981 has 2 divisors, whose sum is σ = 157562911537982. Its totient is φ = 157562911537980.

The previous prime is 157562911537951. The next prime is 157562911538063. The reversal of 157562911537981 is 189735119265751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157448941153956 + 113970384025 = 12547866^2 + 337595^2 .

It is a cyclic number.

It is not a de Polignac number, because 157562911537981 - 2⁴³ = 148766818515773 is a prime.

It is a super-2 number, since 2×157562911537981² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 157562911537981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157562911537951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78781455768990 + 78781455768991.

It is an arithmetic number, because the mean of its divisors is an integer number (78781455768991).

Almost surely, 2^{157562911537981} is an apocalyptic number.

It is an amenable number.

157562911537981 is a deficient number, since it is larger than the sum of its proper divisors (1).

157562911537981 is an equidigital number, since it uses as much as digits as its factorization.

157562911537981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 142884000, while the sum is 70.

The spelling of 157562911537981 in words is "one hundred fifty-seven trillion, five hundred sixty-two billion, nine hundred eleven million, five hundred thirty-seven thousand, nine hundred eighty-one".