78420661943 has 16 divisors (see below), whose sum is σ = 86071579776. Its totient is φ = 71001765120.

The previous prime is 78420661877. The next prime is 78420661951. The reversal of 78420661943 is 34916602487.

It is not a de Polignac number, because 78420661943 - 2¹⁶ = 78420596407 is a prime.

It is a super-2 number, since 2×78420661943² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78420661891 and 78420661900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78420663943) 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, 2659346 + ... + 2688672.

It is an arithmetic number, because the mean of its divisors is an integer number (5379473736).

Almost surely, 2^78420661943 is an apocalyptic number.

78420661943 is a deficient number, since it is larger than the sum of its proper divisors (7650917833).

78420661943 is a wasteful number, since it uses less digits than its factorization.

78420661943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33274.

The product of its (nonzero) digits is 1741824, while the sum is 50.

The spelling of 78420661943 in words is "seventy-eight billion, four hundred twenty million, six hundred sixty-one thousand, nine hundred forty-three".