972561046649 has 2 divisors, whose sum is σ = 972561046650. Its totient is φ = 972561046648.

The previous prime is 972561046621. The next prime is 972561046679. The reversal of 972561046649 is 946640165279.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 561592866025 + 410968180624 = 749395^2 + 641068^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-972561046649 is a prime.

It is not a weakly prime, because it can be changed into another prime (972561046679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 486280523324 + 486280523325.

It is an arithmetic number, because the mean of its divisors is an integer number (486280523325).

Almost surely, 2^972561046649 is an apocalyptic number.

It is an amenable number.

972561046649 is a deficient number, since it is larger than the sum of its proper divisors (1).

972561046649 is an equidigital number, since it uses as much as digits as its factorization.

972561046649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19595520, while the sum is 59.

The spelling of 972561046649 in words is "nine hundred seventy-two billion, five hundred sixty-one million, forty-six thousand, six hundred forty-nine".