1961157437220 has 96 divisors (see below), whose sum is σ = 5640168240000. Its totient is φ = 508794338304.

The previous prime is 1961157437209. The next prime is 1961157437279. The reversal of 1961157437220 is 227347511691.

It is a super-3 number, since 3×1961157437220³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 1961157437220.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28934931 + ... + 29002629.

It is an arithmetic number, because the mean of its divisors is an integer number (58751752500).

Almost surely, 2^{1961157437220} is an apocalyptic number.

1961157437220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1961157437220 is an abundant number, since it is smaller than the sum of its proper divisors (3679010802780).

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

1961157437220 is a wasteful number, since it uses less digits than its factorization.

1961157437220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80797 (or 80795 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 48.

The spelling of 1961157437220 in words is "one trillion, nine hundred sixty-one billion, one hundred fifty-seven million, four hundred thirty-seven thousand, two hundred twenty".