3640657225551 has 16 divisors (see below), whose sum is σ = 4962346411008. Its totient is φ = 2373137589600.

The previous prime is 3640657225489. The next prime is 3640657225567. The reversal of 3640657225551 is 1555227560463.

It is not a de Polignac number, because 3640657225551 - 2¹⁷ = 3640657094479 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3640657225494 and 3640657225503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3640657225571) 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, 12500635 + ... + 12788556.

It is an arithmetic number, because the mean of its divisors is an integer number (310146650688).

Almost surely, 2^{3640657225551} is an apocalyptic number.

3640657225551 is a deficient number, since it is larger than the sum of its proper divisors (1321689185457).

3640657225551 is a wasteful number, since it uses less digits than its factorization.

3640657225551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25290262.

The product of its (nonzero) digits is 7560000, while the sum is 51.

The spelling of 3640657225551 in words is "three trillion, six hundred forty billion, six hundred fifty-seven million, two hundred twenty-five thousand, five hundred fifty-one".