97864780821 has 16 divisors (see below), whose sum is σ = 139042067904. Its totient is φ = 61014230784.

The previous prime is 97864780771. The next prime is 97864780823. The reversal of 97864780821 is 12808746879.

It is not a de Polignac number, because 97864780821 - 2⁶ = 97864780757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97864780823) 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, 6103195 + ... + 6119208.

It is an arithmetic number, because the mean of its divisors is an integer number (8690129244).

Almost surely, 2^97864780821 is an apocalyptic number.

It is an amenable number.

97864780821 is a deficient number, since it is larger than the sum of its proper divisors (41177287083).

97864780821 is a wasteful number, since it uses less digits than its factorization.

97864780821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12222580.

The product of its (nonzero) digits is 10838016, while the sum is 60.

The spelling of 97864780821 in words is "ninety-seven billion, eight hundred sixty-four million, seven hundred eighty thousand, eight hundred twenty-one".