1625387253891 has 16 divisors (see below), whose sum is σ = 2171655170304. Its totient is φ = 1081356048864.

The previous prime is 1625387253877. The next prime is 1625387253901. The reversal of 1625387253891 is 1983527835261.

It is not a de Polignac number, because 1625387253891 - 2⁹ = 1625387253379 is a prime.

It is a super-2 number, since 2×1625387253891² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1625387252891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10777890 + ... + 10927656.

It is an arithmetic number, because the mean of its divisors is an integer number (135728448144).

Almost surely, 2^{1625387253891} is an apocalyptic number.

1625387253891 is a deficient number, since it is larger than the sum of its proper divisors (546267916413).

1625387253891 is a wasteful number, since it uses less digits than its factorization.

1625387253891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157210.

The product of its digits is 21772800, while the sum is 60.

The spelling of 1625387253891 in words is "one trillion, six hundred twenty-five billion, three hundred eighty-seven million, two hundred fifty-three thousand, eight hundred ninety-one".