55661007689040 has 160 divisors (see below), whose sum is σ = 190143578782080. Its totient is φ = 13382539204608.

The previous prime is 55661007689039. The next prime is 55661007689071. The reversal of 55661007689040 is 4098670016655.

It is a super-2 number, since 2×55661007689040² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 207308475 + ... + 207576794.

It is an arithmetic number, because the mean of its divisors is an integer number (1188397367388).

Almost surely, 2^{55661007689040} is an apocalyptic number.

It is an amenable number.

55661007689040 is an abundant number, since it is smaller than the sum of its proper divisors (134482571093040).

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

55661007689040 is a wasteful number, since it uses less digits than its factorization.

55661007689040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414885341 (or 414885335 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 57.

The spelling of 55661007689040 in words is "fifty-five trillion, six hundred sixty-one billion, seven million, six hundred eighty-nine thousand, forty".