157861607905 has 32 divisors (see below), whose sum is σ = 194459908608. Its totient is φ = 122967936000.

The previous prime is 157861607899. The next prime is 157861607957. The reversal of 157861607905 is 509706168751.

It is a happy number.

It is not a de Polignac number, because 157861607905 - 2²³ = 157853219297 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44204770 + ... + 44208340.

It is an arithmetic number, because the mean of its divisors is an integer number (6076872144).

Almost surely, 2^157861607905 is an apocalyptic number.

It is an amenable number.

157861607905 is a deficient number, since it is larger than the sum of its proper divisors (36598300703).

157861607905 is a wasteful number, since it uses less digits than its factorization.

157861607905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4537.

The product of its (nonzero) digits is 3175200, while the sum is 55.

The spelling of 157861607905 in words is "one hundred fifty-seven billion, eight hundred sixty-one million, six hundred seven thousand, nine hundred five".