1972101561978 has 16 divisors (see below), whose sum is σ = 4176215072640. Its totient is φ = 618698529216.

The previous prime is 1972101561967. The next prime is 1972101562003. The reversal of 1972101561978 is 8791651012791.

It is a super-3 number, since 3×1972101561978³ (a number of 38 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9667164418 + ... + 9667164621.

It is an arithmetic number, because the mean of its divisors is an integer number (261013442040).

Almost surely, 2^{1972101561978} is an apocalyptic number.

1972101561978 is an abundant number, since it is smaller than the sum of its proper divisors (2204113510662).

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

1972101561978 is a wasteful number, since it uses less digits than its factorization.

1972101561978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19334329061.

The product of its (nonzero) digits is 1905120, while the sum is 57.

The spelling of 1972101561978 in words is "one trillion, nine hundred seventy-two billion, one hundred one million, five hundred sixty-one thousand, nine hundred seventy-eight".