151781506638 has 16 divisors (see below), whose sum is σ = 303906809856. Its totient is φ = 50536536120.

The previous prime is 151781506637. The next prime is 151781506649. The reversal of 151781506638 is 836605187151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151781506637) 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, 14319118 + ... + 14329713.

It is an arithmetic number, because the mean of its divisors is an integer number (18994175616).

Almost surely, 2^151781506638 is an apocalyptic number.

151781506638 is an abundant number, since it is smaller than the sum of its proper divisors (152125303218).

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

151781506638 is a wasteful number, since it uses less digits than its factorization.

151781506638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28649719.

The product of its (nonzero) digits is 1209600, while the sum is 51.

The spelling of 151781506638 in words is "one hundred fifty-one billion, seven hundred eighty-one million, five hundred six thousand, six hundred thirty-eight".