51397450494 has 48 divisors (see below), whose sum is σ = 114901185024. Its totient is φ = 15304442400.

The previous prime is 51397450439. The next prime is 51397450499. The reversal of 51397450494 is 49405479315.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51397450499) 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, 786112 + ... + 848979.

It is an arithmetic number, because the mean of its divisors is an integer number (2393774688).

Almost surely, 2^51397450494 is an apocalyptic number.

51397450494 is an abundant number, since it is smaller than the sum of its proper divisors (63503734530).

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

51397450494 is a wasteful number, since it uses less digits than its factorization.

51397450494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1635153 (or 1635140 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 51.

The spelling of 51397450494 in words is "fifty-one billion, three hundred ninety-seven million, four hundred fifty thousand, four hundred ninety-four".