61645651412412 has 12 divisors (see below), whose sum is σ = 143839853295656. Its totient is φ = 20548550470800.

The previous prime is 61645651412383. The next prime is 61645651412461. The reversal of 61645651412412 is 21421415654616.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×61645651412412² (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 3 ways as a sum of consecutive naturals, for example, 2568568808839 + ... + 2568568808862.

Almost surely, 2^{61645651412412} is an apocalyptic number.

It is an amenable number.

61645651412412 is an abundant number, since it is smaller than the sum of its proper divisors (82194201883244).

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

61645651412412 is a wasteful number, since it uses less digits than its factorization.

61645651412412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5137137617708 (or 5137137617706 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 48.

The spelling of 61645651412412 in words is "sixty-one trillion, six hundred forty-five billion, six hundred fifty-one million, four hundred twelve thousand, four hundred twelve".