61621753162665 has 8 divisors (see below), whose sum is σ = 98594805060288. Its totient is φ = 32864935020080.

The previous prime is 61621753162637. The next prime is 61621753162667. The reversal of 61621753162665 is 56626135712616.

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

It is not a de Polignac number, because 61621753162665 - 2¹³ = 61621753154473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61621753162667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2054058438741 + ... + 2054058438770.

It is an arithmetic number, because the mean of its divisors is an integer number (12324350632536).

Almost surely, 2^{61621753162665} is an apocalyptic number.

It is an amenable number.

61621753162665 is a deficient number, since it is larger than the sum of its proper divisors (36973051897623).

61621753162665 is a wasteful number, since it uses less digits than its factorization.

61621753162665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4108116877519.

The product of its digits is 16329600, while the sum is 57.

The spelling of 61621753162665 in words is "sixty-one trillion, six hundred twenty-one billion, seven hundred fifty-three million, one hundred sixty-two thousand, six hundred sixty-five".