1864656361780 has 24 divisors (see below), whose sum is σ = 4146118264008. Its totient is φ = 701988277248.

The previous prime is 1864656361759. The next prime is 1864656361781. The reversal of 1864656361780 is 871636564681.

It can be written as a sum of positive squares in 4 ways, for example, as 377285863696 + 1487370498084 = 614236^2 + 1219578^2 .

It is a hoax number, since the sum of its digits (61) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1864656361781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2742141369 + ... + 2742142048.

It is an arithmetic number, because the mean of its divisors is an integer number (172754927667).

Almost surely, 2^{1864656361780} is an apocalyptic number.

1864656361780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1864656361780 is an abundant number, since it is smaller than the sum of its proper divisors (2281461902228).

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

1864656361780 is a wasteful number, since it uses less digits than its factorization.

1864656361780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5484283443 (or 5484283441 counting only the distinct ones).

The product of its (nonzero) digits is 34836480, while the sum is 61.

The spelling of 1864656361780 in words is "one trillion, eight hundred sixty-four billion, six hundred fifty-six million, three hundred sixty-one thousand, seven hundred eighty".