66440007633632 has 96 divisors (see below), whose sum is σ = 131955224252544. Its totient is φ = 32929174080000.

The previous prime is 66440007633619. The next prime is 66440007633677. The reversal of 66440007633632 is 23633670004466.

It is a super-2 number, since 2×66440007633632² (a number of 28 digits) 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, 1629889283 + ... + 1629930045.

It is an arithmetic number, because the mean of its divisors is an integer number (1374533585964).

Almost surely, 2^{66440007633632} is an apocalyptic number.

It is an amenable number.

66440007633632 is a deficient number, since it is larger than the sum of its proper divisors (65515216618912).

66440007633632 is a wasteful number, since it uses less digits than its factorization.

66440007633632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41992 (or 41984 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 50.

The spelling of 66440007633632 in words is "sixty-six trillion, four hundred forty billion, seven million, six hundred thirty-three thousand, six hundred thirty-two".