1625494651 has 16 divisors (see below), whose sum is σ = 1818635616. Its totient is φ = 1440000000.

The previous prime is 1625494621. The next prime is 1625494657. The reversal of 1625494651 is 1564945261.

It is a 11-Lehmer number, since φ(1625494651) divides (1625494651-1)¹¹.

It is a cyclic number.

It is not a de Polignac number, because 1625494651 - 2²¹ = 1623397499 is a prime.

It is a super-2 number, since 2×1625494651² = 5284465720859223602, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1625494598 and 1625494607.

It is not an unprimeable number, because it can be changed into a prime (1625494657) 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, 540151 + ... + 543151.

It is an arithmetic number, because the mean of its divisors is an integer number (113664726).

Almost surely, 2^1625494651 is an apocalyptic number.

1625494651 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1625494651 is the 18031-st centered decagonal number.

1625494651 is a deficient number, since it is larger than the sum of its proper divisors (193140965).

1625494651 is a wasteful number, since it uses less digits than its factorization.

1625494651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4254.

The product of its digits is 259200, while the sum is 43.

The square root of 1625494651 is about 40317.4236652096. The cubic root of 1625494651 is about 1175.7866230460.

The spelling of 1625494651 in words is "one billion, six hundred twenty-five million, four hundred ninety-four thousand, six hundred fifty-one".