697742361921 has 24 divisors (see below), whose sum is σ = 1024959422592. Its totient is φ = 421892917600.

The previous prime is 697742361817. The next prime is 697742361989. The reversal of 697742361921 is 129163247796.

It is a happy number.

It is not a de Polignac number, because 697742361921 - 2¹⁵ = 697742329153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (697742311921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2073426 + ... + 2386331.

It is an arithmetic number, because the mean of its divisors is an integer number (42706642608).

Almost surely, 2^697742361921 is an apocalyptic number.

It is an amenable number.

697742361921 is a deficient number, since it is larger than the sum of its proper divisors (327217060671).

697742361921 is a wasteful number, since it uses less digits than its factorization.

697742361921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4460213 (or 4460202 counting only the distinct ones).

The product of its digits is 6858432, while the sum is 57.

The spelling of 697742361921 in words is "six hundred ninety-seven billion, seven hundred forty-two million, three hundred sixty-one thousand, nine hundred twenty-one".