187920378751 has 4 divisors (see below), whose sum is σ = 214766147152. Its totient is φ = 161074610352.

The previous prime is 187920378721. The next prime is 187920378787. The reversal of 187920378751 is 157873029781.

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

It is a cyclic number.

It is not a de Polignac number, because 187920378751 - 2¹³ = 187920370559 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 (187920378721) 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, 13422884190 + ... + 13422884203.

It is an arithmetic number, because the mean of its divisors is an integer number (53691536788).

Almost surely, 2^187920378751 is an apocalyptic number.

187920378751 is a deficient number, since it is larger than the sum of its proper divisors (26845768401).

187920378751 is an equidigital number, since it uses as much as digits as its factorization.

187920378751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26845768400.

The product of its (nonzero) digits is 5927040, while the sum is 58.

The spelling of 187920378751 in words is "one hundred eighty-seven billion, nine hundred twenty million, three hundred seventy-eight thousand, seven hundred fifty-one".