61636401 has 12 divisors (see below), whose sum is σ = 91902720. Its totient is φ = 39765240.

The previous prime is 61636369. The next prime is 61636409. The reversal of 61636401 is 10463616.

61636401 is a `hidden beast` number, since 6 + 16 + 3 + 640 + 1 = 666.

It is not a de Polignac number, because 61636401 - 2⁵ = 61636369 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61636409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 110181 + ... + 110738.

It is an arithmetic number, because the mean of its divisors is an integer number (7658560).

Almost surely, 2^61636401 is an apocalyptic number.

It is an amenable number.

61636401 is a deficient number, since it is larger than the sum of its proper divisors (30266319).

61636401 is a wasteful number, since it uses less digits than its factorization.

61636401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220956 (or 220953 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 61636401 is about 7850.8853640847. The cubic root of 61636401 is about 395.0139417180.

The spelling of 61636401 in words is "sixty-one million, six hundred thirty-six thousand, four hundred one".