7251665545 has 16 divisors (see below), whose sum is σ = 9028343808. Its totient is φ = 5585670720.

The previous prime is 7251665467. The next prime is 7251665563. The reversal of 7251665545 is 5455661527.

It is not a de Polignac number, because 7251665545 - 2¹⁷ = 7251534473 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7251665495 and 7251665504.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88209 + ... + 149278.

It is an arithmetic number, because the mean of its divisors is an integer number (564271488).

Almost surely, 2^7251665545 is an apocalyptic number.

It is an amenable number.

7251665545 is a deficient number, since it is larger than the sum of its proper divisors (1776678263).

7251665545 is a wasteful number, since it uses less digits than its factorization.

7251665545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237720.

The product of its digits is 1260000, while the sum is 46.

The square root of 7251665545 is about 85156.7116849870. The cubic root of 7251665545 is about 1935.5865186035.

The spelling of 7251665545 in words is "seven billion, two hundred fifty-one million, six hundred sixty-five thousand, five hundred forty-five".