971553723567761 has 4 divisors (see below), whose sum is σ = 971885651730432. Its totient is φ = 971221795405092.

The previous prime is 971553723567743. The next prime is 971553723567767. The reversal of 971553723567761 is 167765327355179.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-971553723567761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (971553723567767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165964076945 + ... + 165964082798.

It is an arithmetic number, because the mean of its divisors is an integer number (242971412932608).

Almost surely, 2^{971553723567761} is an apocalyptic number.

It is an amenable number.

971553723567761 is a deficient number, since it is larger than the sum of its proper divisors (331928162671).

971553723567761 is a wasteful number, since it uses less digits than its factorization.

971553723567761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331928162670.

The product of its digits is 1750329000, while the sum is 74.

The spelling of 971553723567761 in words is "nine hundred seventy-one trillion, five hundred fifty-three billion, seven hundred twenty-three million, five hundred sixty-seven thousand, seven hundred sixty-one".