61821996900 has 72 divisors (see below), whose sum is σ = 178913069664. Its totient is φ = 16482048000.

The previous prime is 61821996889. The next prime is 61821996911. The reversal of 61821996900 is 969912816.

61821996900 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (61821996889) and next prime (61821996911).

It is a super-2 number, since 2×61821996900² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1418839 + ... + 1461761.

Almost surely, 2^61821996900 is an apocalyptic number.

61821996900 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61821996900 is an abundant number, since it is smaller than the sum of its proper divisors (117091072764).

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

61821996900 is a wasteful number, since it uses less digits than its factorization.

61821996900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47741 (or 47734 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 51.

The spelling of 61821996900 in words is "sixty-one billion, eight hundred twenty-one million, nine hundred ninety-six thousand, nine hundred".