1420778651978 has 64 divisors (see below), whose sum is σ = 2462086748160. Its totient is φ = 602329411008.

The previous prime is 1420778651951. The next prime is 1420778651983. The reversal of 1420778651978 is 8791568770241.

It is a super-2 number, since 2×1420778651978² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 700925801 + ... + 700927827.

It is an arithmetic number, because the mean of its divisors is an integer number (38470105440).

Almost surely, 2^{1420778651978} is an apocalyptic number.

1420778651978 is a deficient number, since it is larger than the sum of its proper divisors (1041308096182).

1420778651978 is a wasteful number, since it uses less digits than its factorization.

1420778651978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3459.

The product of its (nonzero) digits is 47416320, while the sum is 65.

The spelling of 1420778651978 in words is "one trillion, four hundred twenty billion, seven hundred seventy-eight million, six hundred fifty-one thousand, nine hundred seventy-eight".