61938211584 has 72 divisors (see below), whose sum is σ = 165757092592. Its totient is φ = 20531957760.

The previous prime is 61938211561. The next prime is 61938211591. The reversal of 61938211584 is 48511283916.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83779 + ... + 361794.

Almost surely, 2^61938211584 is an apocalyptic number.

61938211584 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

61938211584 is an abundant number, since it is smaller than the sum of its proper divisors (103818881008).

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

61938211584 is a wasteful number, since it uses less digits than its factorization.

61938211584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445773 (or 445759 counting only the distinct ones).

The product of its digits is 414720, while the sum is 48.

The spelling of 61938211584 in words is "sixty-one billion, nine hundred thirty-eight million, two hundred eleven thousand, five hundred eighty-four".