125403901665 has 32 divisors (see below), whose sum is σ = 230828630016. Its totient is φ = 56947838400.

The previous prime is 125403901663. The next prime is 125403901741. The reversal of 125403901665 is 566109304521.

It is not a de Polignac number, because 125403901665 - 2¹ = 125403901663 is a prime.

It is a super-2 number, since 2×125403901665² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (125403901663) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3938857 + ... + 3970566.

It is an arithmetic number, because the mean of its divisors is an integer number (7213394688).

Almost surely, 2^125403901665 is an apocalyptic number.

125403901665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

125403901665 is a deficient number, since it is larger than the sum of its proper divisors (105424728351).

125403901665 is a wasteful number, since it uses less digits than its factorization.

125403901665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7909589.

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 125403901665 in words is "one hundred twenty-five billion, four hundred three million, nine hundred one thousand, six hundred sixty-five".