691677745416 has 384 divisors, whose sum is σ = 2336256000000. Its totient is φ = 180405066240.

The previous prime is 691677745411. The next prime is 691677745439. The reversal of 691677745416 is 614547776196.

691677745416 is a `hidden beast` number, since 6 + 9 + 16 + 7 + 7 + 74 + 541 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (691677745411) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 70943710 + ... + 70953458.

It is an arithmetic number, because the mean of its divisors is an integer number (6084000000).

Almost surely, 2^691677745416 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 691677745416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1168128000000).

691677745416 is an abundant number, since it is smaller than the sum of its proper divisors (1644578254584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

691677745416 is a wasteful number, since it uses less digits than its factorization.

691677745416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10057 (or 10050 counting only the distinct ones).

The product of its digits is 53343360, while the sum is 63.

The spelling of 691677745416 in words is "six hundred ninety-one billion, six hundred seventy-seven million, seven hundred forty-five thousand, four hundred sixteen".