81656102 has 16 divisors (see below), whose sum is σ = 134182224. Its totient is φ = 36960000.

The previous prime is 81656101. The next prime is 81656131. The reversal of 81656102 is 20165618.

It is a happy number.

It is a super-3 number, since 3×81656102³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81656101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2399 + ... + 13002.

It is an arithmetic number, because the mean of its divisors is an integer number (8386389).

Almost surely, 2^81656102 is an apocalyptic number.

81656102 is a deficient number, since it is larger than the sum of its proper divisors (52526122).

81656102 is a wasteful number, since it uses less digits than its factorization.

81656102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15655.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 81656102 is about 9036.3765968446. The cubic root of 81656102 is about 433.8399567041.

The spelling of 81656102 in words is "eighty-one million, six hundred fifty-six thousand, one hundred two".