61064478621 has 12 divisors (see below), whose sum is σ = 91049545600. Its totient is φ = 39396437640.

The previous prime is 61064478583. The next prime is 61064478641. The reversal of 61064478621 is 12687446016.

61064478621 is a `hidden beast` number, since 6 + 10 + 6 + 4 + 4 + 7 + 8 + 621 = 666.

It is not a de Polignac number, because 61064478621 - 2¹³ = 61064470429 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61064478641) 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, 109434271 + ... + 109434828.

Almost surely, 2^61064478621 is an apocalyptic number.

It is an amenable number.

61064478621 is a deficient number, since it is larger than the sum of its proper divisors (29985066979).

61064478621 is a wasteful number, since it uses less digits than its factorization.

61064478621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218869136 (or 218869133 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The spelling of 61064478621 in words is "sixty-one billion, sixty-four million, four hundred seventy-eight thousand, six hundred twenty-one".