691447452274 has 4 divisors (see below), whose sum is σ = 1037171178414. Its totient is φ = 345723726136.

The previous prime is 691447452259. The next prime is 691447452349. The reversal of 691447452274 is 472254744196.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 657777771225 + 33669681049 = 811035^2 + 183493^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172861863067 + ... + 172861863070.

Almost surely, 2^691447452274 is an apocalyptic number.

691447452274 is a deficient number, since it is larger than the sum of its proper divisors (345723726140).

691447452274 is a wasteful number, since it uses less digits than its factorization.

691447452274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345723726139.

The product of its digits is 13547520, while the sum is 55.

The spelling of 691447452274 in words is "six hundred ninety-one billion, four hundred forty-seven million, four hundred fifty-two thousand, two hundred seventy-four".