61404639823998 has 12 divisors (see below), whose sum is σ = 133043386285368. Its totient is φ = 20468213274660.

The previous prime is 61404639823993. The next prime is 61404639824063. The reversal of 61404639823998 is 89932893640416.

61404639823998 is a `hidden beast` number, since 6 + 1 + 40 + 463 + 9 + 8 + 2 + 39 + 98 = 666.

It is a super-2 number, since 2×61404639823998² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61404639823993) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1705684439538 + ... + 1705684439573.

It is an arithmetic number, because the mean of its divisors is an integer number (11086948857114).

Almost surely, 2^{61404639823998} is an apocalyptic number.

61404639823998 is an abundant number, since it is smaller than the sum of its proper divisors (71638746461370).

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

61404639823998 is a wasteful number, since it uses less digits than its factorization.

61404639823998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3411368879119 (or 3411368879116 counting only the distinct ones).

The product of its (nonzero) digits is 483729408, while the sum is 72.

The spelling of 61404639823998 in words is "sixty-one trillion, four hundred four billion, six hundred thirty-nine million, eight hundred twenty-three thousand, nine hundred ninety-eight".