51021994149 has 64 divisors (see below), whose sum is σ = 89463029760. Its totient is φ = 28123200000.

The previous prime is 51021994123. The next prime is 51021994213. The reversal of 51021994149 is 94149912015.

51021994149 is a `hidden beast` number, since 5 + 10 + 219 + 9 + 414 + 9 = 666.

51021994149 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51021994149 - 2⁷ = 51021994021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51021996149) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1808149 + ... + 1836149.

It is an arithmetic number, because the mean of its divisors is an integer number (1397859840).

Almost surely, 2^51021994149 is an apocalyptic number.

It is an amenable number.

51021994149 is a deficient number, since it is larger than the sum of its proper divisors (38441035611).

51021994149 is a wasteful number, since it uses less digits than its factorization.

51021994149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28359 (or 28353 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The spelling of 51021994149 in words is "fifty-one billion, twenty-one million, nine hundred ninety-four thousand, one hundred forty-nine".