61977850212 has 24 divisors (see below), whose sum is σ = 145079992512. Its totient is φ = 20592853600.

The previous prime is 61977850201. The next prime is 61977850237. The reversal of 61977850212 is 21205877916.

It is a super-2 number, since 2×61977850212² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8299839 + ... + 8307302.

It is an arithmetic number, because the mean of its divisors is an integer number (6044999688).

Almost surely, 2^61977850212 is an apocalyptic number.

It is an amenable number.

61977850212 is an abundant number, since it is smaller than the sum of its proper divisors (83102142300).

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

61977850212 is a wasteful number, since it uses less digits than its factorization.

61977850212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16607459 (or 16607457 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 48.

The spelling of 61977850212 in words is "sixty-one billion, nine hundred seventy-seven million, eight hundred fifty thousand, two hundred twelve".