61605600001 has 4 divisors (see below), whose sum is σ = 67206109104. Its totient is φ = 56005090900.

The previous prime is 61605599999. The next prime is 61605600031. The reversal of 61605600001 is 10000650616.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 61605600001 - 2¹ = 61605599999 is a prime.

It is a super-2 number, since 2×61605600001² (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 (61605600031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2800254535 + ... + 2800254556.

It is an arithmetic number, because the mean of its divisors is an integer number (16801527276).

Almost surely, 2^61605600001 is an apocalyptic number.

It is an amenable number.

61605600001 is a deficient number, since it is larger than the sum of its proper divisors (5600509103).

61605600001 is a wasteful number, since it uses less digits than its factorization.

61605600001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5600509102.

The product of its (nonzero) digits is 1080, while the sum is 25.

The spelling of 61605600001 in words is "sixty-one billion, six hundred five million, six hundred thousand, one".