61621739712 has 112 divisors (see below), whose sum is σ = 195091690080. Its totient is φ = 18960528384.

The previous prime is 61621739693. The next prime is 61621739713. The reversal of 61621739712 is 21793712616.

61621739712 is a `hidden beast` number, since 6 + 1 + 621 + 7 + 3 + 9 + 7 + 12 = 666.

It is not an unprimeable number, because it can be changed into a prime (61621739713) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1349103 + ... + 1394030.

It is an arithmetic number, because the mean of its divisors is an integer number (1741890090).

Almost surely, 2^61621739712 is an apocalyptic number.

It is an amenable number.

61621739712 is an abundant number, since it is smaller than the sum of its proper divisors (133469950368).

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

61621739712 is a wasteful number, since it uses less digits than its factorization.

61621739712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2743167 (or 2743151 counting only the distinct ones).

The product of its digits is 190512, while the sum is 45.

The spelling of 61621739712 in words is "sixty-one billion, six hundred twenty-one million, seven hundred thirty-nine thousand, seven hundred twelve".