81612210750 has 128 divisors (see below), whose sum is σ = 233735943168. Its totient is φ = 18579600000.

The previous prime is 81612210737. The next prime is 81612210763. The reversal of 81612210750 is 5701221618.

It is an interprime number because it is at equal distance from previous prime (81612210737) and next prime (81612210763).

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 63 ways as a sum of consecutive naturals, for example, 1286784 + ... + 1348716.

It is an arithmetic number, because the mean of its divisors is an integer number (1826062056).

Almost surely, 2^81612210750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81612210750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116867971584).

81612210750 is an abundant number, since it is smaller than the sum of its proper divisors (152123732418).

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

81612210750 is a wasteful number, since it uses less digits than its factorization.

81612210750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62211 (or 62201 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 33.

The spelling of 81612210750 in words is "eighty-one billion, six hundred twelve million, two hundred ten thousand, seven hundred fifty".