461620861551 has 12 divisors (see below), whose sum is σ = 666794411712. Its totient is φ = 307743215136.

The previous prime is 461620861531. The next prime is 461620861591. The reversal of 461620861551 is 155168026164.

461620861551 is a `hidden beast` number, since 4 + 6 + 1 + 6 + 20 + 8 + 615 + 5 + 1 = 666.

It is not a de Polignac number, because 461620861551 - 2⁶ = 461620861487 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 461620861497 and 461620861506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (461620861501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 500290 + ... + 1083296.

It is an arithmetic number, because the mean of its divisors is an integer number (55566200976).

Almost surely, 2^461620861551 is an apocalyptic number.

461620861551 is a deficient number, since it is larger than the sum of its proper divisors (205173550161).

461620861551 is a wasteful number, since it uses less digits than its factorization.

461620861551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670990 (or 670987 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The spelling of 461620861551 in words is "four hundred sixty-one billion, six hundred twenty million, eight hundred sixty-one thousand, five hundred fifty-one".