187712667649 has 4 divisors (see below), whose sum is σ = 202152103636. Its totient is φ = 173273231664.

The previous prime is 187712667631. The next prime is 187712667707. The reversal of 187712667649 is 946766217781.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50762343025 + 136950324624 = 225305^2 + 370068^2 .

It is not a de Polignac number, because 187712667649 - 2¹³ = 187712659457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (187712667629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7219717974 + ... + 7219717999.

It is an arithmetic number, because the mean of its divisors is an integer number (50538025909).

Almost surely, 2^187712667649 is an apocalyptic number.

It is an amenable number.

187712667649 is a deficient number, since it is larger than the sum of its proper divisors (14439435987).

187712667649 is a wasteful number, since it uses less digits than its factorization.

187712667649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14439435986.

The product of its digits is 42674688, while the sum is 64.

The spelling of 187712667649 in words is "one hundred eighty-seven billion, seven hundred twelve million, six hundred sixty-seven thousand, six hundred forty-nine".