690396471801 has 27 divisors (see below), whose sum is σ = 1007389916559. Its totient is φ = 455626225152.

The previous prime is 690396471763. The next prime is 690396471827. The reversal of 690396471801 is 108174693096.

The square root of 690396471801 is 830901.

It is a perfect power (a square), and thus also a powerful number.

690396471801 is a `hidden beast` number, since 6 + 9 + 0 + 3 + 96 + 471 + 80 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 24932094201 + 665464377600 = 157899^2 + 815760^2 .

It is not a de Polignac number, because 690396471801 - 2¹⁷ = 690396340729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (690396471871) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 256747065 + ... + 256749753.

Almost surely, 2^690396471801 is an apocalyptic number.

690396471801 is the 830901-st square number.

690396471801 is the 415451-st centered octagonal number.

It is an amenable number.

690396471801 is a deficient number, since it is larger than the sum of its proper divisors (316993444758).

690396471801 is an frugal number, since it uses more digits than its factorization.

With its predecessor (690396471800) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (5590).

690396471801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5590 (or 2795 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The spelling of 690396471801 in words is "six hundred ninety billion, three hundred ninety-six million, four hundred seventy-one thousand, eight hundred one".