157620535517 has 4 divisors (see below), whose sum is σ = 159391552860. Its totient is φ = 155849518176.

The previous prime is 157620535489. The next prime is 157620535537. The reversal of 157620535517 is 715535026751.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 54280146361 + 103340389156 = 232981^2 + 321466^2 .

It is a cyclic number.

It is not a de Polignac number, because 157620535517 - 2²² = 157616341213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157620535537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 885508538 + ... + 885508715.

It is an arithmetic number, because the mean of its divisors is an integer number (39847888215).

Almost surely, 2^157620535517 is an apocalyptic number.

It is an amenable number.

157620535517 is a deficient number, since it is larger than the sum of its proper divisors (1771017343).

157620535517 is an equidigital number, since it uses as much as digits as its factorization.

157620535517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1771017342.

The product of its (nonzero) digits is 1102500, while the sum is 47.

The spelling of 157620535517 in words is "one hundred fifty-seven billion, six hundred twenty million, five hundred thirty-five thousand, five hundred seventeen".