201506051778 has 64 divisors (see below), whose sum is σ = 427858329600. Its totient is φ = 63131492160.

The previous prime is 201506051753. The next prime is 201506051891. The reversal of 201506051778 is 877150605102.

It is a super-2 number, since 2×201506051778² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8734783 + ... + 8757821.

It is an arithmetic number, because the mean of its divisors is an integer number (6685286400).

Almost surely, 2^201506051778 is an apocalyptic number.

201506051778 is an abundant number, since it is smaller than the sum of its proper divisors (226352277822).

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

201506051778 is a wasteful number, since it uses less digits than its factorization.

201506051778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24167.

The product of its (nonzero) digits is 117600, while the sum is 42.

The spelling of 201506051778 in words is "two hundred one billion, five hundred six million, fifty-one thousand, seven hundred seventy-eight".