691411790745 has 96 divisors (see below), whose sum is σ = 1299085386144. Its totient is φ = 338162688000.

The previous prime is 691411790717. The next prime is 691411790767. The reversal of 691411790745 is 547097114196.

It is a happy number.

691411790745 is a `hidden beast` number, since 6 + 91 + 411 + 79 + 0 + 74 + 5 = 666.

It can be written as a sum of positive squares in 16 ways, for example, as 654929262729 + 36482528016 = 809277^2 + 191004^2 .

It is not a de Polignac number, because 691411790745 - 2¹⁹ = 691411266457 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 691411790691 and 691411790700.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 127165167 + ... + 127170603.

It is an arithmetic number, because the mean of its divisors is an integer number (13532139439).

Almost surely, 2^691411790745 is an apocalyptic number.

691411790745 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

691411790745 is a deficient number, since it is larger than the sum of its proper divisors (607673595399).

691411790745 is a wasteful number, since it uses less digits than its factorization.

691411790745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6843 (or 6840 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 54.

The spelling of 691411790745 in words is "six hundred ninety-one billion, four hundred eleven million, seven hundred ninety thousand, seven hundred forty-five".