1961787611264 has 32 divisors (see below), whose sum is σ = 4208883280140. Its totient is φ = 905440435200.

The previous prime is 1961787611249. The next prime is 1961787611269. The reversal of 1961787611264 is 4621167871691.

It can be written as a sum of positive squares in 2 ways, for example, as 1445746521664 + 516041089600 = 1202392^2 + 718360^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×1961787611264² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1961787611269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 589477787 + ... + 589481114.

Almost surely, 2^{1961787611264} is an apocalyptic number.

It is an amenable number.

1961787611264 is an abundant number, since it is smaller than the sum of its proper divisors (2247095668876).

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

1961787611264 is a wasteful number, since it uses less digits than its factorization.

1961787611264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178958928 (or 1178958916 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 59.

The spelling of 1961787611264 in words is "one trillion, nine hundred sixty-one billion, seven hundred eighty-seven million, six hundred eleven thousand, two hundred sixty-four".