61971328117 has 2 divisors, whose sum is σ = 61971328118. Its totient is φ = 61971328116.

The previous prime is 61971328103. The next prime is 61971328187. The reversal of 61971328117 is 71182317916.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32109414481 + 29861913636 = 179191^2 + 172806^2 .

It is a cyclic number.

It is not a de Polignac number, because 61971328117 - 2¹⁵ = 61971295349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61971328187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30985664058 + 30985664059.

It is an arithmetic number, because the mean of its divisors is an integer number (30985664059).

Almost surely, 2^61971328117 is an apocalyptic number.

It is an amenable number.

61971328117 is a deficient number, since it is larger than the sum of its proper divisors (1).

61971328117 is an equidigital number, since it uses as much as digits as its factorization.

61971328117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 46.

The spelling of 61971328117 in words is "sixty-one billion, nine hundred seventy-one million, three hundred twenty-eight thousand, one hundred seventeen".