78618151265501 has 4 divisors (see below), whose sum is σ = 79029764623104. Its totient is φ = 78206537907900.

The previous prime is 78618151265483. The next prime is 78618151265597. The reversal of 78618151265501 is 10556215181687.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78618151265501 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78618151265201) 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, 205806678515 + ... + 205806678896.

It is an arithmetic number, because the mean of its divisors is an integer number (19757441155776).

Almost surely, 2^{78618151265501} is an apocalyptic number.

It is an amenable number.

78618151265501 is a deficient number, since it is larger than the sum of its proper divisors (411613357603).

78618151265501 is a wasteful number, since it uses less digits than its factorization.

78618151265501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411613357602.

The product of its (nonzero) digits is 4032000, while the sum is 56.

The spelling of 78618151265501 in words is "seventy-eight trillion, six hundred eighteen billion, one hundred fifty-one million, two hundred sixty-five thousand, five hundred one".