4951778491971 has 24 divisors (see below), whose sum is σ = 7573778675424. Its totient is φ = 3106805287680.

The previous prime is 4951778491969. The next prime is 4951778491987. The reversal of 4951778491971 is 1791948771594.

4951778491971 is a `hidden beast` number, since 49 + 5 + 1 + 7 + 7 + 8 + 491 + 97 + 1 = 666.

It is not a de Polignac number, because 4951778491971 - 2¹ = 4951778491969 is a prime.

It is a super-2 number, since 2×4951778491971² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 4951778491971.

It is not an unprimeable number, because it can be changed into a prime (4951778491991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1486345 + ... + 3480341.

It is an arithmetic number, because the mean of its divisors is an integer number (315574111476).

Almost surely, 2^{4951778491971} is an apocalyptic number.

4951778491971 is a deficient number, since it is larger than the sum of its proper divisors (2622000183453).

4951778491971 is a wasteful number, since it uses less digits than its factorization.

4951778491971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2010251 (or 2010248 counting only the distinct ones).

The product of its digits is 160030080, while the sum is 72.

The spelling of 4951778491971 in words is "four trillion, nine hundred fifty-one billion, seven hundred seventy-eight million, four hundred ninety-one thousand, nine hundred seventy-one".