6642617440 has 24 divisors (see below), whose sum is σ = 15693184080. Its totient is φ = 2657046912.

The previous prime is 6642617369. The next prime is 6642617453. The reversal of 6642617440 is 447162466.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 6642617393 and 6642617402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20758020 + ... + 20758339.

It is an arithmetic number, because the mean of its divisors is an integer number (653882670).

Almost surely, 2^6642617440 is an apocalyptic number.

It is an amenable number.

6642617440 is an abundant number, since it is smaller than the sum of its proper divisors (9050566640).

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

6642617440 is a wasteful number, since it uses less digits than its factorization.

6642617440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41516374 (or 41516366 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 40.

The square root of 6642617440 is about 81502.2542019544. The cubic root of 6642617440 is about 1879.8062121062.

The spelling of 6642617440 in words is "six billion, six hundred forty-two million, six hundred seventeen thousand, four hundred forty".