73170778261 has 12 divisors (see below), whose sum is σ = 85139521740. Its totient is φ = 62701235520.

The previous prime is 73170778253. The next prime is 73170778273. The reversal of 73170778261 is 16287707137.

It can be written as a sum of positive squares in 2 ways, for example, as 39105062500 + 34065715761 = 197750^2 + 184569^2 .

It is not a de Polignac number, because 73170778261 - 2³ = 73170778253 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73170778661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8176 + ... + 382633.

It is an arithmetic number, because the mean of its divisors is an integer number (7094960145).

Almost surely, 2^73170778261 is an apocalyptic number.

It is an amenable number.

73170778261 is a deficient number, since it is larger than the sum of its proper divisors (11968743479).

73170778261 is a wasteful number, since it uses less digits than its factorization.

73170778261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394644 (or 394637 counting only the distinct ones).

The product of its (nonzero) digits is 691488, while the sum is 49.

The spelling of 73170778261 in words is "seventy-three billion, one hundred seventy million, seven hundred seventy-eight thousand, two hundred sixty-one".