2154965939778 has 8 divisors (see below), whose sum is σ = 4309931879568. Its totient is φ = 718321979924.

The previous prime is 2154965939767. The next prime is 2154965939801. The reversal of 2154965939778 is 8779395694512.

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

2154965939778 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179580494976 + ... + 179580494987.

It is an arithmetic number, because the mean of its divisors is an integer number (538741484946).

Almost surely, 2^{2154965939778} is an apocalyptic number.

2154965939778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2154965939778 is a wasteful number, since it uses less digits than its factorization.

2154965939778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359160989968.

The product of its digits is 1028764800, while the sum is 75.

The spelling of 2154965939778 in words is "two trillion, one hundred fifty-four billion, nine hundred sixty-five million, nine hundred thirty-nine thousand, seven hundred seventy-eight".