157868774905 has 4 divisors (see below), whose sum is σ = 189442529892. Its totient is φ = 126295019920.

The previous prime is 157868774893. The next prime is 157868774909. The reversal of 157868774905 is 509477868751.

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 71918366976 + 85950407929 = 268176^2 + 293173^2 .

It is not a de Polignac number, because 157868774905 - 2¹⁵ = 157868742137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157868774909) 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, 15786877486 + ... + 15786877495.

It is an arithmetic number, because the mean of its divisors is an integer number (47360632473).

Almost surely, 2^157868774905 is an apocalyptic number.

It is an amenable number.

157868774905 is a deficient number, since it is larger than the sum of its proper divisors (31573754987).

157868774905 is an equidigital number, since it uses as much as digits as its factorization.

157868774905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31573754986.

The product of its (nonzero) digits is 118540800, while the sum is 67.

The spelling of 157868774905 in words is "one hundred fifty-seven billion, eight hundred sixty-eight million, seven hundred seventy-four thousand, nine hundred five".