61299997786900 has 36 divisors (see below), whose sum is σ = 133027522498332. Its totient is φ = 24518795925760.

The previous prime is 61299997786871. The next prime is 61299997786921. The reversal of 61299997786900 is 968779999216.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 4330652564484 + 56969345222416 = 2081022^2 + 7547804^2 .

It is a super-2 number, since 2×61299997786900² (a number of 28 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 11 ways as a sum of consecutive naturals, for example, 12990367 + ... + 17068966.

It is an arithmetic number, because the mean of its divisors is an integer number (3695208958287).

Almost surely, 2^{61299997786900} is an apocalyptic number.

It is an amenable number.

61299997786900 is an abundant number, since it is smaller than the sum of its proper divisors (71727524711432).

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

61299997786900 is a wasteful number, since it uses less digits than its factorization.

61299997786900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30079740 (or 30079733 counting only the distinct ones).

The product of its (nonzero) digits is 1666598976, while the sum is 82.

The spelling of 61299997786900 in words is "sixty-one trillion, two hundred ninety-nine billion, nine hundred ninety-seven million, seven hundred eighty-six thousand, nine hundred".