1647139741972 has 24 divisors (see below), whose sum is σ = 2931892346880. Its totient is φ = 809475972960.

The previous prime is 1647139741963. The next prime is 1647139741991. The reversal of 1647139741972 is 2791479317461.

It is a super-3 number, since 3×1647139741972³ (a number of 38 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a self number, because there is not a number n which added to its sum of digits gives 1647139741972.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2135572 + ... + 2802667.

It is an arithmetic number, because the mean of its divisors is an integer number (122162181120).

Almost surely, 2^{1647139741972} is an apocalyptic number.

It is an amenable number.

1647139741972 is a deficient number, since it is larger than the sum of its proper divisors (1284752604908).

1647139741972 is a wasteful number, since it uses less digits than its factorization.

1647139741972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4939671 (or 4939669 counting only the distinct ones).

The product of its digits is 16003008, while the sum is 61.

The spelling of 1647139741972 in words is "one trillion, six hundred forty-seven billion, one hundred thirty-nine million, seven hundred forty-one thousand, nine hundred seventy-two".