61621111696 has 45 divisors (see below), whose sum is σ = 120358660113. Its totient is φ = 30562816320.

The previous prime is 61621111667. The next prime is 61621111697. The reversal of 61621111696 is 69611112616.

The square root of 61621111696 is 248236.

It is a perfect power (a square), and thus also a powerful number.

61621111696 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 57390910096 + 4230201600 = 239564^2 + 65040^2 .

It is a super-2 number, since 2×61621111696² (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 (61621111697) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 227384041 + ... + 227384311.

Almost surely, 2^61621111696 is an apocalyptic number.

61621111696 is the 248236-th square number.

It is an amenable number.

61621111696 is a deficient number, since it is larger than the sum of its proper divisors (58737548417).

61621111696 is an frugal number, since it uses more digits than its factorization.

61621111696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008 (or 502 counting only the distinct ones).

The product of its digits is 23328, while the sum is 40.

The spelling of 61621111696 in words is "sixty-one billion, six hundred twenty-one million, one hundred eleven thousand, six hundred ninety-six".