2193977491977 has 4 divisors (see below), whose sum is σ = 2925303322640. Its totient is φ = 1462651661316.

The previous prime is 2193977491957. The next prime is 2193977492009. The reversal of 2193977491977 is 7791947793912.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2193977491977 - 2²⁶ = 2193910383113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2193977491899 and 2193977491908.

It is not an unprimeable number, because it can be changed into a prime (2193977491957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365662915327 + ... + 365662915332.

It is an arithmetic number, because the mean of its divisors is an integer number (731325830660).

Almost surely, 2^{2193977491977} is an apocalyptic number.

It is an amenable number.

2193977491977 is a deficient number, since it is larger than the sum of its proper divisors (731325830663).

2193977491977 is an equidigital number, since it uses as much as digits as its factorization.

2193977491977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731325830662.

The product of its digits is 378071064, while the sum is 75.

The spelling of 2193977491977 in words is "two trillion, one hundred ninety-three billion, nine hundred seventy-seven million, four hundred ninety-one thousand, nine hundred seventy-seven".