125991876394 has 4 divisors (see below), whose sum is σ = 188987814594. Its totient is φ = 62995938196.

The previous prime is 125991876371. The next prime is 125991876397. The reversal of 125991876394 is 493678199521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 493678199521 = 13 ⋅37975246117.

It can be written as a sum of positive squares in only one way, i.e., 123543111169 + 2448765225 = 351487^2 + 49485^2 .

It is not an unprimeable number, because it can be changed into a prime (125991876397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31497969097 + ... + 31497969100.

Almost surely, 2^125991876394 is an apocalyptic number.

125991876394 is a deficient number, since it is larger than the sum of its proper divisors (62995938200).

125991876394 is an equidigital number, since it uses as much as digits as its factorization.

125991876394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62995938199.

The product of its digits is 29393280, while the sum is 64.

The spelling of 125991876394 in words is "one hundred twenty-five billion, nine hundred ninety-one million, eight hundred seventy-six thousand, three hundred ninety-four".