1365640656 has 80 divisors (see below), whose sum is σ = 3734552640. Its totient is φ = 428820480.

The previous prime is 1365640649. The next prime is 1365640693. The reversal of 1365640656 is 6560465631.

It is a super-2 number, since 2×1365640656² = 3729948802640220672, which contains 22 as substring.

It is a congruent number.

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, 160936 + ... + 169208.

It is an arithmetic number, because the mean of its divisors is an integer number (46681908).

Almost surely, 2^1365640656 is an apocalyptic number.

1365640656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1365640656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1867276320).

1365640656 is an abundant number, since it is smaller than the sum of its proper divisors (2368911984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1365640656 is a wasteful number, since it uses less digits than its factorization.

1365640656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8484 (or 8478 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 42.

The square root of 1365640656 is about 36954.5755759689. The cubic root of 1365640656 is about 1109.4612692930.

The spelling of 1365640656 in words is "one billion, three hundred sixty-five million, six hundred forty thousand, six hundred fifty-six".