78216101556541 has 16 divisors (see below), whose sum is σ = 87288236034048. Its totient is φ = 69598593331200.

The previous prime is 78216101556493. The next prime is 78216101556559. The reversal of 78216101556541 is 14565510161287.

It is a cyclic number.

It is not a de Polignac number, because 78216101556541 - 2²¹ = 78216099459389 is a prime.

It is a super-2 number, since 2×78216101556541² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78216101550541) 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, 377492965 + ... + 377700106.

It is an arithmetic number, because the mean of its divisors is an integer number (5455514752128).

Almost surely, 2^{78216101556541} is an apocalyptic number.

It is an amenable number.

78216101556541 is a deficient number, since it is larger than the sum of its proper divisors (9072134477507).

78216101556541 is a wasteful number, since it uses less digits than its factorization.

78216101556541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755193372.

The product of its (nonzero) digits is 2016000, while the sum is 52.

The spelling of 78216101556541 in words is "seventy-eight trillion, two hundred sixteen billion, one hundred one million, five hundred fifty-six thousand, five hundred forty-one".