1961351863432 has 24 divisors (see below), whose sum is σ = 3982182595290. Its totient is φ = 905239320960.

The previous prime is 1961351863409. The next prime is 1961351863447. The reversal of 1961351863432 is 2343681531691.

It can be written as a sum of positive squares in 3 ways, for example, as 1590307633476 + 371044229956 = 1261074^2 + 609134^2 .

It is a super-2 number, since 2×1961351863432² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a self number, because there is not a number n which added to its sum of digits gives 1961351863432.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 725350669 + ... + 725353372.

Almost surely, 2^{1961351863432} is an apocalyptic number.

It is an amenable number.

1961351863432 is an abundant number, since it is smaller than the sum of its proper divisors (2020830731858).

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

1961351863432 is a wasteful number, since it uses less digits than its factorization.

1961351863432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1450704073 (or 1450704056 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 52.

The spelling of 1961351863432 in words is "one trillion, nine hundred sixty-one billion, three hundred fifty-one million, eight hundred sixty-three thousand, four hundred thirty-two".