97786661951 has 24 divisors (see below), whose sum is σ = 108727468080. Its totient is φ = 87872843520.

The previous prime is 97786661941. The next prime is 97786661953. The reversal of 97786661951 is 15916668779.

It is not a de Polignac number, because 97786661951 - 2³⁴ = 80606792767 is a prime.

It is a super-2 number, since 2×97786661951² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97786661953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5702276 + ... + 5719398.

It is an arithmetic number, because the mean of its divisors is an integer number (4530311170).

Almost surely, 2^97786661951 is an apocalyptic number.

97786661951 is a deficient number, since it is larger than the sum of its proper divisors (10940806129).

97786661951 is a wasteful number, since it uses less digits than its factorization.

97786661951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17687 (or 17676 counting only the distinct ones).

The product of its digits is 34292160, while the sum is 65.

The spelling of 97786661951 in words is "ninety-seven billion, seven hundred eighty-six million, six hundred sixty-one thousand, nine hundred fifty-one".