78202172187461 has 16 divisors (see below), whose sum is σ = 94647823156224. Its totient is φ = 63076384506624.

The previous prime is 78202172187353. The next prime is 78202172187463. The reversal of 78202172187461 is 16478127120287.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78202172187461 is a prime.

It is a super-2 number, since 2×78202172187461² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78202172187397 and 78202172187406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78202172187463) 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, 57039125 + ... + 58394058.

It is an arithmetic number, because the mean of its divisors is an integer number (5915488947264).

Almost surely, 2^{78202172187461} is an apocalyptic number.

It is an amenable number.

78202172187461 is a deficient number, since it is larger than the sum of its proper divisors (16445650968763).

78202172187461 is a wasteful number, since it uses less digits than its factorization.

78202172187461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115438900.

The product of its (nonzero) digits is 4214784, while the sum is 56.

The spelling of 78202172187461 in words is "seventy-eight trillion, two hundred two billion, one hundred seventy-two million, one hundred eighty-seven thousand, four hundred sixty-one".