61251333506556 has 48 divisors (see below), whose sum is σ = 143473418661888. Its totient is φ = 20338047259200.

The previous prime is 61251333506537. The next prime is 61251333506569. The reversal of 61251333506556 is 65560533315216.

It is a super-2 number, since 2×61251333506556² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61251333506499 and 61251333506508.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16070346 + ... + 19513038.

It is an arithmetic number, because the mean of its divisors is an integer number (2989029555456).

Almost surely, 2^{61251333506556} is an apocalyptic number.

It is an amenable number.

61251333506556 is an abundant number, since it is smaller than the sum of its proper divisors (82222085155332).

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

61251333506556 is a wasteful number, since it uses less digits than its factorization.

61251333506556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3448442 (or 3448440 counting only the distinct ones).

The product of its (nonzero) digits is 7290000, while the sum is 51.

The spelling of 61251333506556 in words is "sixty-one trillion, two hundred fifty-one billion, three hundred thirty-three million, five hundred six thousand, five hundred fifty-six".