61901665 has 8 divisors (see below), whose sum is σ = 84893760. Its totient is φ = 42446832.

The previous prime is 61901659. The next prime is 61901681. The reversal of 61901665 is 56610916.

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 61901665 - 2²⁵ = 28347233 is a prime.

It is a super-2 number, since 2×61901665² = 7663632259544450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61901665.

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, 884275 + ... + 884344.

It is an arithmetic number, because the mean of its divisors is an integer number (10611720).

Almost surely, 2^61901665 is an apocalyptic number.

It is an amenable number.

61901665 is a deficient number, since it is larger than the sum of its proper divisors (22992095).

61901665 is a wasteful number, since it uses less digits than its factorization.

61901665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1768631.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 61901665 is about 7867.7611173700. The cubic root of 61901665 is about 395.5798033251.

The spelling of 61901665 in words is "sixty-one million, nine hundred one thousand, six hundred sixty-five".