61321617461 has 16 divisors (see below), whose sum is σ = 68500170816. Its totient is φ = 54530775936.

The previous prime is 61321617451. The next prime is 61321617493. The reversal of 61321617461 is 16471612316.

It is a happy number.

It is not a de Polignac number, because 61321617461 - 2²² = 61317423157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61321617451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 710555 + ... + 792168.

It is an arithmetic number, because the mean of its divisors is an integer number (4281260676).

Almost surely, 2^61321617461 is an apocalyptic number.

It is an amenable number.

61321617461 is a deficient number, since it is larger than the sum of its proper divisors (7178553355).

61321617461 is a wasteful number, since it uses less digits than its factorization.

61321617461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1502852.

The product of its digits is 36288, while the sum is 38.

The spelling of 61321617461 in words is "sixty-one billion, three hundred twenty-one million, six hundred seventeen thousand, four hundred sixty-one".