6691523445 has 48 divisors (see below), whose sum is σ = 12296474112. Its totient is φ = 3360320640.

The previous prime is 6691523431. The next prime is 6691523477. The reversal of 6691523445 is 5443251966.

It is not a de Polignac number, because 6691523445 - 2⁴ = 6691523429 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 6691523445.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13207 + ... + 116436.

It is an arithmetic number, because the mean of its divisors is an integer number (256176544).

Almost surely, 2^6691523445 is an apocalyptic number.

It is an amenable number.

6691523445 is a deficient number, since it is larger than the sum of its proper divisors (5604950667).

6691523445 is a wasteful number, since it uses less digits than its factorization.

6691523445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129722 (or 129719 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The square root of 6691523445 is about 81801.7325305522. The cubic root of 6691523445 is about 1884.4082690264.

The spelling of 6691523445 in words is "six billion, six hundred ninety-one million, five hundred twenty-three thousand, four hundred forty-five".