37878191491 has 4 divisors (see below), whose sum is σ = 43289361712. Its totient is φ = 32467021272.

The previous prime is 37878191431. The next prime is 37878191567. The reversal of 37878191491 is 19419187873.

37878191491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19419187873 = 17 ⋅1142305169.

It is not a de Polignac number, because 37878191491 - 2¹⁵ = 37878158723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (37878191431) 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, 2705585100 + ... + 2705585113.

It is an arithmetic number, because the mean of its divisors is an integer number (10822340428).

Almost surely, 2^37878191491 is an apocalyptic number.

37878191491 is a deficient number, since it is larger than the sum of its proper divisors (5411170221).

37878191491 is an equidigital number, since it uses as much as digits as its factorization.

37878191491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5411170220.

The product of its digits is 3048192, while the sum is 58.

The spelling of 37878191491 in words is "thirty-seven billion, eight hundred seventy-eight million, one hundred ninety-one thousand, four hundred ninety-one".