1651278071972 has 12 divisors (see below), whose sum is σ = 2889748335180. Its totient is φ = 825635690496.

The previous prime is 1651278071969. The next prime is 1651278071977. The reversal of 1651278071972 is 2791708721561.

It can be written as a sum of positive squares in 2 ways, for example, as 1644077870656 + 7200201316 = 1282216^2 + 84854^2 .

It is a super-2 number, since 2×1651278071972² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1651278071977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 517808 + ... + 1889624.

It is an arithmetic number, because the mean of its divisors is an integer number (240812361265).

Almost surely, 2^{1651278071972} is an apocalyptic number.

It is an amenable number.

1651278071972 is a deficient number, since it is larger than the sum of its proper divisors (1238470263208).

1651278071972 is a wasteful number, since it uses less digits than its factorization.

1651278071972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1672750 (or 1672748 counting only the distinct ones).

The product of its (nonzero) digits is 2963520, while the sum is 56.

The spelling of 1651278071972 in words is "one trillion, six hundred fifty-one billion, two hundred seventy-eight million, seventy-one thousand, nine hundred seventy-two".