125621979590 has 16 divisors (see below), whose sum is σ = 230385971088. Its totient is φ = 49300701216.

The previous prime is 125621979563. The next prime is 125621979599. The reversal of 125621979590 is 95979126521.

It is a super-2 number, since 2×125621979590² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125621979599) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118510772 + ... + 118511831.

It is an arithmetic number, because the mean of its divisors is an integer number (14399123193).

Almost surely, 2^125621979590 is an apocalyptic number.

125621979590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

125621979590 is a deficient number, since it is larger than the sum of its proper divisors (104763991498).

125621979590 is a wasteful number, since it uses less digits than its factorization.

125621979590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237022663.

The product of its (nonzero) digits is 3061800, while the sum is 56.

The spelling of 125621979590 in words is "one hundred twenty-five billion, six hundred twenty-one million, nine hundred seventy-nine thousand, five hundred ninety".