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18649542977 = 132080768947
BaseRepresentation
bin10001010111100110…
…010111000101000001
31210010201101221110222
4101113212113011001
5301143240333402
612322324232425
71230103333262
oct212746270501
953121357428
1018649542977
117a001a973a
12374583b715
1319b2984540
14c8cbcc969
157424107a2
hex457997141

18649542977 has 8 divisors (see below), whose sum is σ = 20085379776. Its totient is φ = 17213885712.

The previous prime is 18649542911. The next prime is 18649542983. The reversal of 18649542977 is 77924594681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18649542977 - 224 = 18632765761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18649542077) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236018 + ... + 304964.

It is an arithmetic number, because the mean of its divisors is an integer number (2510672472).

Almost surely, 218649542977 is an apocalyptic number.

It is an amenable number.

18649542977 is a deficient number, since it is larger than the sum of its proper divisors (1435836799).

18649542977 is a wasteful number, since it uses less digits than its factorization.

18649542977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89767.

The product of its digits is 30481920, while the sum is 62.

The spelling of 18649542977 in words is "eighteen billion, six hundred forty-nine million, five hundred forty-two thousand, nine hundred seventy-seven".

Divisors: 1 13 20807 68947 270491 896311 1434580229 18649542977