61620561603 has 6 divisors (see below), whose sum is σ = 89007477884. Its totient is φ = 41080374396.

The previous prime is 61620561599. The next prime is 61620561617. The reversal of 61620561603 is 30616502616.

61620561603 is a `hidden beast` number, since 6 + 16 + 20 + 5 + 616 + 0 + 3 = 666.

It is not a de Polignac number, because 61620561603 - 2² = 61620561599 is a prime.

It is a super-2 number, since 2×61620561603² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61620561703) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3423364525 + ... + 3423364542.

Almost surely, 2^61620561603 is an apocalyptic number.

61620561603 is a deficient number, since it is larger than the sum of its proper divisors (27386916281).

61620561603 is a wasteful number, since it uses less digits than its factorization.

61620561603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6846729073 (or 6846729070 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The spelling of 61620561603 in words is "sixty-one billion, six hundred twenty million, five hundred sixty-one thousand, six hundred three".