51208449978 has 16 divisors (see below), whose sum is σ = 117047885760. Its totient is φ = 14630985696.

The previous prime is 51208449977. The next prime is 51208450019. The reversal of 51208449978 is 87994480215.

It is not an unprimeable number, because it can be changed into a prime (51208449977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 609624363 + ... + 609624446.

It is an arithmetic number, because the mean of its divisors is an integer number (7315492860).

Almost surely, 2^51208449978 is an apocalyptic number.

51208449978 is an abundant number, since it is smaller than the sum of its proper divisors (65839435782).

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

51208449978 is a wasteful number, since it uses less digits than its factorization.

51208449978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1219248821.

The product of its (nonzero) digits is 5806080, while the sum is 57.

The spelling of 51208449978 in words is "fifty-one billion, two hundred eight million, four hundred forty-nine thousand, nine hundred seventy-eight".