61656401 has 8 divisors (see below), whose sum is σ = 62469120. Its totient is φ = 60847488.

The previous prime is 61656391. The next prime is 61656403. The reversal of 61656401 is 10465616.

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 61656401 - 2⁶ = 61656337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61656403) 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, 45800 + ... + 47126.

It is an arithmetic number, because the mean of its divisors is an integer number (7808640).

Almost surely, 2^61656401 is an apocalyptic number.

It is an amenable number.

61656401 is a deficient number, since it is larger than the sum of its proper divisors (812719).

61656401 is a wasteful number, since it uses less digits than its factorization.

61656401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1903.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 61656401 is about 7852.1590024655. The cubic root of 61656401 is about 395.0566622769.

The spelling of 61656401 in words is "sixty-one million, six hundred fifty-six thousand, four hundred one".