61653404436 has 72 divisors (see below), whose sum is σ = 159985504224. Its totient is φ = 18457545600.

The previous prime is 61653404357. The next prime is 61653404441. The reversal of 61653404436 is 63440435616.

It is a super-2 number, since 2×61653404436² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 335790 + ... + 485861.

It is an arithmetic number, because the mean of its divisors is an integer number (2222020892).

Almost surely, 2^61653404436 is an apocalyptic number.

It is an amenable number.

61653404436 is an abundant number, since it is smaller than the sum of its proper divisors (98332099788).

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

61653404436 is a wasteful number, since it uses less digits than its factorization.

61653404436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821721 (or 821706 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 42.

The spelling of 61653404436 in words is "sixty-one billion, six hundred fifty-three million, four hundred four thousand, four hundred thirty-six".