78535510436661 has 48 divisors (see below), whose sum is σ = 115695176002560. Its totient is φ = 47233969629120.

The previous prime is 78535510436657. The next prime is 78535510436687. The reversal of 78535510436661 is 16663401553587.

It is not a de Polignac number, because 78535510436661 - 2² = 78535510436657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78535510436595 and 78535510436604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78535510436161) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7039255 + ... + 14374356.

It is an arithmetic number, because the mean of its divisors is an integer number (2410316166720).

Almost surely, 2^{78535510436661} is an apocalyptic number.

It is an amenable number.

78535510436661 is a deficient number, since it is larger than the sum of its proper divisors (37159665565899).

78535510436661 is a wasteful number, since it uses less digits than its factorization.

78535510436661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21413754 (or 21413717 counting only the distinct ones).

The product of its (nonzero) digits is 54432000, while the sum is 60.

The spelling of 78535510436661 in words is "seventy-eight trillion, five hundred thirty-five billion, five hundred ten million, four hundred thirty-six thousand, six hundred sixty-one".