1878770640117 has 32 divisors (see below), whose sum is σ = 2877531931648. Its totient is φ = 1068105108096.

The previous prime is 1878770640113. The next prime is 1878770640137. The reversal of 1878770640117 is 7110460778781.

It is a happy number.

It is not a de Polignac number, because 1878770640117 - 2² = 1878770640113 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 (1878770640113) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3164418 + ... + 3710940.

It is an arithmetic number, because the mean of its divisors is an integer number (89922872864).

Almost surely, 2^{1878770640117} is an apocalyptic number.

It is an amenable number.

1878770640117 is a deficient number, since it is larger than the sum of its proper divisors (998761291531).

1878770640117 is a wasteful number, since it uses less digits than its factorization.

1878770640117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547369.

The product of its (nonzero) digits is 3687936, while the sum is 57.

The spelling of 1878770640117 in words is "one trillion, eight hundred seventy-eight billion, seven hundred seventy million, six hundred forty thousand, one hundred seventeen".