1977016641 has 8 divisors (see below), whose sum is σ = 2651807424. Its totient is φ = 1310118480.

The previous prime is 1977016631. The next prime is 1977016669. The reversal of 1977016641 is 1466107791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1977016641 - 2⁶ = 1977016577 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1977016593 and 1977016602.

It is not an unprimeable number, because it can be changed into a prime (1977016631) 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, 1972570 + ... + 1973571.

It is an arithmetic number, because the mean of its divisors is an integer number (331475928).

Almost surely, 2^1977016641 is an apocalyptic number.

It is an amenable number.

1977016641 is a deficient number, since it is larger than the sum of its proper divisors (674790783).

1977016641 is a wasteful number, since it uses less digits than its factorization.

1977016641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3946311.

The product of its (nonzero) digits is 63504, while the sum is 42.

The square root of 1977016641 is about 44463.6552815893. The cubic root of 1977016641 is about 1255.0762409305.

The spelling of 1977016641 in words is "one billion, nine hundred seventy-seven million, sixteen thousand, six hundred forty-one".