97902249638 has 4 divisors (see below), whose sum is σ = 146853374460. Its totient is φ = 48951124818.

The previous prime is 97902249631. The next prime is 97902249649. The reversal of 97902249638 is 83694220979.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×97902249638² (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 (97902249631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24475562408 + ... + 24475562411.

It is an arithmetic number, because the mean of its divisors is an integer number (36713343615).

Almost surely, 2^97902249638 is an apocalyptic number.

97902249638 is a deficient number, since it is larger than the sum of its proper divisors (48951124822).

97902249638 is a wasteful number, since it uses less digits than its factorization.

97902249638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48951124821.

The product of its (nonzero) digits is 11757312, while the sum is 59.

The spelling of 97902249638 in words is "ninety-seven billion, nine hundred two million, two hundred forty-nine thousand, six hundred thirty-eight".