778554016940 has 24 divisors (see below), whose sum is σ = 1868529640992. Its totient is φ = 266932805760.

The previous prime is 778554016937. The next prime is 778554016943. The reversal of 778554016940 is 49610455877.

It is a happy number.

778554016940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (778554016937) and next prime (778554016943).

It is a super-2 number, since 2×778554016940² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (778554016943) 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, 2780549921 + ... + 2780550200.

It is an arithmetic number, because the mean of its divisors is an integer number (77855401708).

Almost surely, 2^778554016940 is an apocalyptic number.

778554016940 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

778554016940 is an abundant number, since it is smaller than the sum of its proper divisors (1089975624052).

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

778554016940 is a wasteful number, since it uses less digits than its factorization.

778554016940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5561100137 (or 5561100135 counting only the distinct ones).

The product of its (nonzero) digits is 8467200, while the sum is 56.

The spelling of 778554016940 in words is "seven hundred seventy-eight billion, five hundred fifty-four million, sixteen thousand, nine hundred forty".