1961398457512 has 32 divisors (see below), whose sum is σ = 3960576506880. Its totient is φ = 905247023040.

The previous prime is 1961398457507. The next prime is 1961398457537. The reversal of 1961398457512 is 2157548931691.

It is a super-3 number, since 3×1961398457512³ (a number of 38 digits) contains 333 as substring.

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 7 ways as a sum of consecutive naturals, for example, 10429837 + ... + 10616227.

It is an arithmetic number, because the mean of its divisors is an integer number (123768015840).

Almost surely, 2^{1961398457512} is an apocalyptic number.

It is an amenable number.

1961398457512 is an abundant number, since it is smaller than the sum of its proper divisors (1999178049368).

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

1961398457512 is a wasteful number, since it uses less digits than its factorization.

1961398457512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287593 (or 287589 counting only the distinct ones).

The product of its digits is 16329600, while the sum is 61.

The spelling of 1961398457512 in words is "one trillion, nine hundred sixty-one billion, three hundred ninety-eight million, four hundred fifty-seven thousand, five hundred twelve".