61499804212 has 48 divisors (see below), whose sum is σ = 138509844480. Its totient is φ = 23188024800.

The previous prime is 61499804209. The next prime is 61499804221. The reversal of 61499804212 is 21240899416.

It is a super-2 number, since 2×61499804212² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3211012 + ... + 3230107.

It is an arithmetic number, because the mean of its divisors is an integer number (2885621760).

Almost surely, 2^61499804212 is an apocalyptic number.

61499804212 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

61499804212 is an abundant number, since it is smaller than the sum of its proper divisors (77010040268).

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

61499804212 is a wasteful number, since it uses less digits than its factorization.

61499804212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6441172 (or 6441170 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 46.

The spelling of 61499804212 in words is "sixty-one billion, four hundred ninety-nine million, eight hundred four thousand, two hundred twelve".