81770987461254 has 256 divisors, whose sum is σ = 208521501081600. Its totient is φ = 20800777729536.

The previous prime is 81770987461193. The next prime is 81770987461307. The reversal of 81770987461254 is 45216478907718.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3281459007 + ... + 3281483925.

It is an arithmetic number, because the mean of its divisors is an integer number (814537113600).

Almost surely, 2^{81770987461254} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81770987461254, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104260750540800).

81770987461254 is an abundant number, since it is smaller than the sum of its proper divisors (126750513620346).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81770987461254 is a wasteful number, since it uses less digits than its factorization.

81770987461254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26387.

The product of its (nonzero) digits is 189665280, while the sum is 69.

The spelling of 81770987461254 in words is "eighty-one trillion, seven hundred seventy billion, nine hundred eighty-seven million, four hundred sixty-one thousand, two hundred fifty-four".