16991420677 has 16 divisors (see below), whose sum is σ = 21190223232. Its totient is φ = 13236246720.

The previous prime is 16991420669. The next prime is 16991420689. The reversal of 16991420677 is 77602419961.

It is a cyclic number.

It is not a de Polignac number, because 16991420677 - 2³ = 16991420669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16991420617) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 253123 + ... + 313135.

It is an arithmetic number, because the mean of its divisors is an integer number (1324388952).

Almost surely, 2^16991420677 is an apocalyptic number.

It is an amenable number.

16991420677 is a deficient number, since it is larger than the sum of its proper divisors (4198802555).

16991420677 is a wasteful number, since it uses less digits than its factorization.

16991420677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63708.

The product of its (nonzero) digits is 1143072, while the sum is 52.

The spelling of 16991420677 in words is "sixteen billion, nine hundred ninety-one million, four hundred twenty thousand, six hundred seventy-seven".