61801665 has 8 divisors (see below), whose sum is σ = 98882688. Its totient is φ = 32960880.

The previous prime is 61801651. The next prime is 61801669. The reversal of 61801665 is 56610816.

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

It is not a de Polignac number, because 61801665 - 2⁵ = 61801633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61801669) 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, 2060041 + ... + 2060070.

It is an arithmetic number, because the mean of its divisors is an integer number (12360336).

Almost surely, 2^61801665 is an apocalyptic number.

It is an amenable number.

61801665 is a deficient number, since it is larger than the sum of its proper divisors (37081023).

61801665 is a wasteful number, since it uses less digits than its factorization.

61801665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4120119.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 61801665 is about 7861.4035006480. The cubic root of 61801665 is about 395.3666733498.

The spelling of 61801665 in words is "sixty-one million, eight hundred one thousand, six hundred sixty-five".