6411935720978 has 4 divisors (see below), whose sum is σ = 9617903581470. Its totient is φ = 3205967860488.

The previous prime is 6411935720977. The next prime is 6411935721029. The reversal of 6411935720978 is 8790275391146.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 5831128641529 + 580807079449 = 2414773^2 + 762107^2 .

It is a super-2 number, since 2×6411935720978² (a number of 26 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6411935720978.

It is not an unprimeable number, because it can be changed into a prime (6411935720977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1602983930243 + ... + 1602983930246.

It is a 1-persistent number, because it is pandigital, but 2⋅6411935720978 = 12823871441956 is not.

Almost surely, 2^{6411935720978} is an apocalyptic number.

6411935720978 is a deficient number, since it is larger than the sum of its proper divisors (3205967860492).

6411935720978 is a wasteful number, since it uses less digits than its factorization.

6411935720978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3205967860491.

The product of its (nonzero) digits is 22861440, while the sum is 62.

The spelling of 6411935720978 in words is "six trillion, four hundred eleven billion, nine hundred thirty-five million, seven hundred twenty thousand, nine hundred seventy-eight".