2651644465 has 16 divisors (see below), whose sum is σ = 3354592320. Its totient is φ = 2006579520.

The previous prime is 2651644459. The next prime is 2651644469. The reversal of 2651644465 is 5644461562.

It is a de Polignac number, because none of the positive numbers 2^k-2651644465 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2651644469) 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, 41682 + ... + 83908.

It is an arithmetic number, because the mean of its divisors is an integer number (209662020).

Almost surely, 2^2651644465 is an apocalyptic number.

It is an amenable number.

2651644465 is a deficient number, since it is larger than the sum of its proper divisors (702947855).

2651644465 is a wasteful number, since it uses less digits than its factorization.

2651644465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42912.

The product of its digits is 691200, while the sum is 43.

The square root of 2651644465 is about 51494.1206838218. The cubic root of 2651644465 is about 1384.1136904792.

The spelling of 2651644465 in words is "two billion, six hundred fifty-one million, six hundred forty-four thousand, four hundred sixty-five".