61605812749445 has 8 divisors (see below), whose sum is σ = 73943539739136. Its totient is φ = 49273607239696.

The previous prime is 61605812749421. The next prime is 61605812749483. The reversal of 61605812749445 is 54494721850616.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61605812749445 - 2¹⁴ = 61605812733061 is a prime.

It is a super-2 number, since 2×61605812749445² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1380345437 + ... + 1380390066.

It is an arithmetic number, because the mean of its divisors is an integer number (9242942467392).

Almost surely, 2^{61605812749445} is an apocalyptic number.

It is an amenable number.

61605812749445 is a deficient number, since it is larger than the sum of its proper divisors (12337726989691).

61605812749445 is a wasteful number, since it uses less digits than its factorization.

61605812749445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2760739971.

The product of its (nonzero) digits is 58060800, while the sum is 62.

The spelling of 61605812749445 in words is "sixty-one trillion, six hundred five billion, eight hundred twelve million, seven hundred forty-nine thousand, four hundred forty-five".