1978506513079 has 16 divisors (see below), whose sum is σ = 2127844730880. Its totient is φ = 1833722483040.

The previous prime is 1978506513073. The next prime is 1978506513089. The reversal of 1978506513079 is 9703156058791.

It is a cyclic number.

It is not a de Polignac number, because 1978506513079 - 2⁷ = 1978506512951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978506513073) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1663149 + ... + 2592889.

It is an arithmetic number, because the mean of its divisors is an integer number (132990295680).

Almost surely, 2^{1978506513079} is an apocalyptic number.

1978506513079 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1978506513079 is a deficient number, since it is larger than the sum of its proper divisors (149338217801).

1978506513079 is a wasteful number, since it uses less digits than its factorization.

1978506513079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 932190.

The product of its (nonzero) digits is 14288400, while the sum is 61.

The spelling of 1978506513079 in words is "one trillion, nine hundred seventy-eight billion, five hundred six million, five hundred thirteen thousand, seventy-nine".