1625902961881 has 27 divisors (see below), whose sum is σ = 1886469797919. Its totient is φ = 1400069682000.

The previous prime is 1625902961873. The next prime is 1625902961899. The reversal of 1625902961881 is 1881692095261.

The square root of 1625902961881 is 1275109.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1027910071881 + 597992890000 = 1013859^2 + 773300^2 .

It is not a de Polignac number, because 1625902961881 - 2³ = 1625902961873 is a prime.

It is a super-2 number, since 2×1625902961881² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1625902967881) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 266494731 + ... + 266500831.

Almost surely, 2^{1625902961881} is an apocalyptic number.

1625902961881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1625902961881 is the 1275109-th square number.

1625902961881 is the 637555-th centered octagonal number.

It is an amenable number.

1625902961881 is a deficient number, since it is larger than the sum of its proper divisors (260566836038).

1625902961881 is an frugal number, since it uses more digits than its factorization.

1625902961881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12262 (or 6131 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 58.

The spelling of 1625902961881 in words is "one trillion, six hundred twenty-five billion, nine hundred two million, nine hundred sixty-one thousand, eight hundred eighty-one".