19778037330 has 32 divisors (see below), whose sum is σ = 47474022528. Its totient is φ = 5273395200.

The previous prime is 19778037319. The next prime is 19778037347. The reversal of 19778037330 is 3373087791.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19778037330.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187515 + ... + 273345.

It is an arithmetic number, because the mean of its divisors is an integer number (1483563204).

Almost surely, 2^19778037330 is an apocalyptic number.

19778037330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19778037330 is an abundant number, since it is smaller than the sum of its proper divisors (27695985198).

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

19778037330 is a wasteful number, since it uses less digits than its factorization.

19778037330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93522.

The product of its (nonzero) digits is 666792, while the sum is 48.

The spelling of 19778037330 in words is "nineteen billion, seven hundred seventy-eight million, thirty-seven thousand, three hundred thirty".